Summer is not eternal

For a year now, Ulyana Zheleznyak has been the director of the "Orion" boarding house. Suddenly, an emergency occurs: a guest disappears without a trace. In his car, left on the boarding house premises, there are ancient tiles. Meanwhile, in the apartment of the murdered collector, similar tiles are found, arranged in a mysterious puzzle...
Ulyana Zheleznyak investigates this case together with investigator Bogdanov, but their complicated relationship complicates the unraveling of difficult puzzles. Gradually, they realize that the traces of the crime lead to the abandoned estate of Tish-na-Toske, where a mysterious light burns at night…